DE449607C - Manufacture of powdered calcium arsenite - Google Patents
Manufacture of powdered calcium arseniteInfo
- Publication number
- DE449607C DE449607C DES77227D DES0077227D DE449607C DE 449607 C DE449607 C DE 449607C DE S77227 D DES77227 D DE S77227D DE S0077227 D DES0077227 D DE S0077227D DE 449607 C DE449607 C DE 449607C
- Authority
- DE
- Germany
- Prior art keywords
- arsenite
- manufacture
- powdered calcium
- lime
- calcium arsenite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G28/00—Compounds of arsenic
- C01G28/02—Arsenates; Arsenites
- C01G28/023—Arsenates; Arsenites of ammonium, alkali or alkaline-earth metals or magnesium
Description
Herstellung von pulverförmigem Galciumarsenit. Das Calciumarsenit hat man bisher nur auf nassem Wege hergestellt, d. h. entweder durch Fällen eines löslichen Arsenits aus seiner wässerigen Lösung mittels eines löslichen Kalksalzes oder aber durch Mischen von arseniger Säure mit Kalkwasser oder besser mit Kalkmilch in der Wärme.Production of powdered calcium arsenite. The calcium arsenite has so far only been produced by the wet method, i. H. either by felling one soluble arsenite from its aqueous solution by means of a soluble lime salt or by mixing arsenic acid with lime water or better with lime milk in the warmth.
Man hat auch vorgeschlagen, einem Gemisch von arseniger Säure und gelöschtem Kalk Wasser zuzufügen, um so zu einem Teige von Calciumarseni-t zu gelangen.It has also been proposed to use a mixture of arsenic acid and add water to slaked lime in order to obtain a dough of calcium arsenic.
Alle diese Verfahren erfordern aber ein Trocknen des feuchten Arsenits und eine darauffolgende Zerkleinerung auf besonderen Einrichtungen und sind wegen der Giftigkeit des Stoffes lästig.However, all of these processes require drying of the moist arsenite and a subsequent crushing on special facilities and are due annoying the toxicity of the substance.
Es ist gefunden worden, daß Calciumarsenit unmittelbar in Form eines staubfeinen Pulvers erhalten werden kann, wenn man Wasserdampf auf eineMischung von gebranntem Kalk und arsenigerSäure (Arsentrioxyd) wirken läßt.It has been found that calcium arsenite is directly in the form of a Fine powder can be obtained by applying steam to a mixture of quick lime and arsenic acid (arsenic trioxide).
Die beiden Oxyde reagieren in Gegenwart von Wasserdampf miteinander, ohne daß die Masse teigig wird, sondern man erhält das Erzeugnis in Pulverform, frei von arseniger Säure.The two oxides react with each other in the presence of water vapor, without the mass becoming doughy, but the product is obtained in powder form, arsenic acid free.
Es ist leicht, diesen Betrieb fortlaufend zu gestalten, z. B. in einer Drehvorrichtung, in der das Gemisch der Oxyde auf einer Seite, der Wasserdampf auf der andern Seite, nach dem Gegenstromprinzip, eintritt.It is easy to make this operation continuous, e.g. B. in a Rotating device in which the mixture of oxides on one side, the water vapor on on the other side, according to the countercurrent principle.
Zur Erzielung eines für gewerblicheZwecke dienenden Erzeugnisses kann man ohne Schwierigkeit gebrannten Kalk und technische arsenige Säure verwenden.To obtain a product that can be used for commercial purposes burnt lime and technical arsenous acid can be used without difficulty.
Verwendet man 3 Mol. Kalk mit i Mol. arseniger Säure, so erhält man das Tricalciumorthoarsenit. Es ist leicht, die Kalkmenge zu vermehren, man erhält dann basische Arsenite, die einen Überschuß an Kalkhydrat enthalten.If 3 moles of lime with 1 mole of arsenic acid are used, one obtains the tricalcium orthoarsenite. It is easy to increase the amount of lime one gets then basic arsenites, which contain an excess of hydrated lime.
Es ist bekannt, derartige Arsenite durch unmittelbare Oxydation mittels Sauerstoffs in Calciumarseniat, 'das für die Landwirtschaft geeignet ist, umzuwandeln.It is known that such arsenites by means of direct oxidation To convert oxygen into calcium arsenate, which is suitable for agriculture.
Man vermeidet durch dieses Verfahren das Trocknen und Zerkleinern des Arsenits, also zwei in der Praxis äußerst lästige Arbeitsvorgänge, und erhält unmittelbar ein äußerst feines Pulver, das man im besonderen zu landwirtschaftlichen Zwecken und zur Umwandlung in Arseniat benutzen kann.This process avoids drying and grinding of arsenite, i.e. two extremely troublesome work processes in practice, and is preserved immediately an extremely fine powder, which is particularly useful for agricultural purposes Purposes and can be used for conversion into arsenate.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR449607X | 1926-07-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE449607C true DE449607C (en) | 1927-09-19 |
Family
ID=8900757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DES77227D Expired DE449607C (en) | 1926-07-29 | 1926-12-01 | Manufacture of powdered calcium arsenite |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE449607C (en) |
-
1926
- 1926-12-01 DE DES77227D patent/DE449607C/en not_active Expired
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